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Starter. If the stick is balanced, how are the masses and distances related?. m 1 r 1 + m 3 r 3 = m 2 r 2 + m 4 r 4. Practice – Torque Problem Set. t = rF For the stick; t = mgr ( units = N . m ). Example. m 1 = 50grams, r 1 = 30cm, and r 2 = 20cm. Find m 2 .

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  1. Starter If the stick is balanced, how are the masses and distances related? m1r1 + m3r3 = m2r2 + m4r4

  2. Practice – Torque Problem Set • t = rF • For the stick; • t = mgr • ( units = N.m )

  3. Example m1 = 50grams, r1 = 30cm, and r2 = 20cm. Find m2. Find the clockwise torque. Find the counter-clockwise torque. 1. m1r1=m2r2 so m2 =m1r1 /r2 = 50(30)/20 = 75 grams. 2. t = rF = m2gr2 = (.075kg)(9.8 m/s2)(.20m) = .147 Nm 3. If balanced, counter-clockwise torque = the clockwise torque =.147Nm

  4. Exit To turn a stubborn screw, is it easier to use a screwdriver with a wide handle of a narrow handle? Explain.

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